Lecture 2 – Combinational Circuits and Verilog - University of Washington
Lecture 2 ? Combinational Circuits and Verilog
CSE P567
Example: r1 = r2 + r3
We need:
Registers Adder function (combinational logic) Wires
Example: r1 = r2 + r3
We need:
Registers adder function (combinational logic) Wires Selection function
We won't always want r2 and r3
Combinational Logic
Functions with no state Output is a function of the inputs only ? no history
add subtract multiply count-ones FSM next state function
All computation is done in binary
Primitive circuit values are on/off, Vdd/GND, current/no current
Review: Binary Encoding of Numbers
Unsigned numbers
bn-12n-1 + bn-22n-2 + . . . + b020
2s complement encoding of signed numbers
-bn-12n-1 + bn-22n-2 + . . . + b020
Same adder works for both unsigned and signed numbers
To negate a number, invert all bits and add 1
As slow as add in worst case
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